Researchers have used the fragrant grass extract known as citronella oil to make food cartons that discourage insect infestation. The extract is an ingredient of perfumes and also an insect repellent in products already on the market. The oil kept beetles from entering containers during a test lasting several months.
Scientists with the research organization Ensis Papro in Rotorua, New Zealand, made cartons from cardboard that they had treated with one of five commercially available plant extracts.
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